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Crystal Structure of Sar1[H79G]-GDP Which Provides Insight into the Coat-controlled GTP Hydrolysis in the Disassembly of COP Ⅱ

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Chinese Journal of Structural Chemistry 2006年第7期25卷 854-860页

作者： RAO Yi-Jian YUAN Cai BIAN Chuan-Bing HOU Xiao-Min LI Yong-dong ZHAO Geng-Xiang YE Xiao-ming HUANG Zi-Xiang HUANG ming-dong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

Sarl is a small GTPase involved in COPⅡ vesicle transport. Previous studies showed that H79G mutation of Sarl can lock Sarl in its GTP-bound active conformation, stabilize coat assembly, and prevent the disassembly of COP Ⅱ vesicle coats by reducing Sec23/24 GAP- stimulated hydrolysis. We show here that the replacement of His79 by glycine induces a large conformation change in switch Ⅱ and results in the lost of hydrogen bond between His79 and its associated nucleophilic water molecule that was hypothesized to reduce the GAP-stimulated hydrolysis during the COP Ⅱ assembly and disassembly. These results confirm that the switch Ⅱ conformation is important for COP Ⅱ disassembly through coat-controlled GTP hydrolysis.

关键词： Sarl switch Ⅱ COP Ⅱ disassembly crystal structure

Comparison of Pb,Cd Adsorption to Surface Coatings Developed in Natural Waters with that in Plant Effluents

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Chemical Research in Chinese Universities 2003年第4期19卷 417-421页

作者： dong De-ming LI Yu HUA Xiu-yi ZHANG Jing-jing College of Environment and Resources Jilin UniversityChangchun 130023P.R.China

The comparative studies of Pb and Cd adsorption to the surface coatings(Fe, Mn, Al oxides, organic materials, and associated minerals), which were developed on glass slides in five natural and two technical waters(plant effluents), were carried out under controlled laboratory conditions(mineral salts solution with defined speciation, ionic strength 0 05 mol/L, 25 ℃ and pH 6 0). The classical Langmuir adsorption isotherm was applied to estimating the equilibrium coefficients of Pb and Cd adsorption to the surface coatings. The results show that the maximum adsorption of Pb and Cd to the surface coatings mentioned above varied widely. There was a systemic increase in the maximum adsorption of Pb and Cd to the surface coatings with increasing the contents of Mn and Fe oxides in the surface coatings in significant correlation, respectively, not only highlighting the relative importance of the metal oxide fraction for Pb and Cd adsorption to the surface coatings developed in natural and technical water samples, but also implying the same adsorption mechanisms of Pb and Cd to the surface coatings developed both in natural and technical water samples.

关键词： Natural waters Plant effluents Surface coatings Pb Cd

Optimizing the atmospheric sampling sites using fuzzy mathe-matic methods

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Journal of Environmental Sciences 2003年第4期15卷 464-468页

作者： FANG Chun sheng WANG Ju dong De ming YU Lian sheng College of Environment and Resources Jilin UniversityChangchun 130023China.

A new approach applying fuzzy mathematic theorems, including the Primary Matrix Element Theorem and the Fisher Classification Method, was established to solve the optimization problem of atmospheric environmental sampling sites. According to its basis, an application in the optimization of sampling sites in the atmospheric environmental monitoring was discussed. The method was proven to be suitable and effective. The results were admitted and applied by the Environmental Protection Bureau (EPB) of many cities of China. A set of computer software of this approach was also completely compiled and used.

关键词： fuzzy set primary matrix element theorem fisher classification method optimization of sampling sites

Electronic and optical properties of single-layer MoS2

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Frontiers of physics 2018年第4期13卷 123-128页

作者： Hai-ming dong San-dong Guo Yi-Feng Duan Fei Huang Wen Xu Jin Zhang School of Physical Science and Technology China University of Mining and Technology Xuzhou 221116 China Low Carbon Energy Institute China University of Mining and Technology Xuzhou 221116 China Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Department of Physics Yunnan University Kunming 650091 China

The electronic structures of a MoS2 monolayer are investigated with the all-electron first principle calculations based on the density functional theory （DFT） and the spin-orbital couplings （SOCs）. Ore＂ results show that the monolayer MoS2 is a direct band gap semiconductor with a band gap of 1.8 eV. The SOCs and d-electrons in Mo play a very significant role in deciding its electronic and optical properties. Moreover, electronic elementary excitations are studied theoretically within the diagram- matic self-consistent field theory. Under random phase approximation, it shows that two branches of plasmon modes can be achieved via the conduction-band transitions due to the SOCs, which are different from the plasmons in a two-dimensional electron gas and graphene owing to the quasi-linear energy dispersion in single-layer MoS2. Moreover, the strong optical absorption up to 105 cm-1 and two optical absorption edges I and II can be observed. This study is relevant to the applications of monolayer MoS2 as an advanced photoelectronic device.

关键词： MoS2 electronic and optical properties

A Novel Phenylpropanoid-substituted Catechin Glycoside and a New Dihydrochalcone from Sarcandra glabra

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Chinese Chemical Letters 2006年第2期17卷 207-210页

作者： Yuan LI dong ming ZHANG Shi Shah YU Jian Bei LI Yong ming LUO Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine Ministry of Education Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050 Faculty of Pharmacy Jiangxi University of Traditional Chinese Medicine Nanchang 330006

A novel phenylpropanoid-substituted catechin glycoside glabraoside A 1 and a new dihydrochalcone 3＇-（7＂-allylphenyl）-2＇,4＇,4＂-trihydroxy-6＇-methoxydihydrochalcone 2 were isolated from the herbs of Sarcandra gl... 详细信息

关键词： Sarcandra glabra glabraoside A phenylpropanoid-substituted flavan-3-ols dihydrochalcone.

A new tetrahydrophenanthrene from Chloranthus henryi

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Chinese Chemical Letters 2010年第2期21卷 206-208页

作者： Fu, Hui Zheng Luo, Yong ming Liu, Hua Zhang, dong ming Ji, Teng Fei Jiangxi Univ Tradit Chinese Med Nanchang 330004 Peoples R China Chinese Acad Med Sci Inst Mat Med Key Lab Bioact Substances & Resources Utilizat Ch Beijing 100050 Peoples R China Peking Union Med Coll Beijing 100050 Peoples R China

A new tetrahydrophenanthrene named henryin A(1) was isolated from the leaves of Chloranthus *** structure was determined to be(S)-4,6,9-trimethyl-5,6,7,8-tetrahydrophenanthrene-1,2-diol on the basis of IR,MS,1D and 2D... 详细信息

关键词： Chloranthus henryi Tetrahydrophenanthrene (S)-4 6 9-Trimethyl-5 7 8-tetrahydrophenanthrene-1 2-diol

Joint specular highlight detection and removal in single images via Unet-Transformer

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Computational Visual Media 2023年第1期9卷 141-154页

作者： Zhongqi Wu Jianwei Guo Chuanqing Zhuang Jun Xiao dong-ming Yan Xiaopeng Zhang National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China The School of Artificial Intelligence University of Chinese Academy of SciencesBeijingChina

Specular highlight detection and removal is a fundamental problem in computer vision and image *** this paper,we present an efficient endto-end deep learning model for automatically detecting and removing specular highlights in a single *** particular,an encoder–decoder network is utilized to detect specular highlights,and then a novel Unet-Transformer network performs highlight removal;we append transformer modules instead of feature maps in the Unet *** also introduce a highlight detection module as a mask to guide the removal ***,these two networks can be jointly trained in an effective *** to the hierarchical and global properties of the transformer mechanism,our framework is able to establish relationships between continuous self-attention layers,making it possible to directly model the mapping between the diffuse area and the specular highlight area,and reduce indeterminacy within areas containing strong specular highlight *** on public benchmark and real-world images demonstrate that our approach outperforms state-of-the-art methods for both highlight detection and removal tasks.

关键词： specular highlight detection specular highlight removal Unet-Transformer

Dynamic Brain Responses Modulated by Precise Timing Prediction in an Opposing Process

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Neuroscience Bulletin 2021年第1期37卷 70-80页

作者： Minpeng Xu Jiayuan Meng Haiqing Yu Tzyy-Ping Jung dong ming College of Precision Instruments and Optoelectronics Engineering Tianjin UniversityTianjin 300072China Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjin 300072China Swartz Center for Computational Neuroscience University of CaliforniaSan DiegoCA 92093USA

The brain function of prediction is fundamental for human beings to shape perceptions efficiently and successively. Through decades of effort, a valuable brain activation map has been obtained for prediction. However,much less is known about how the brain manages the prediction process over time using traditional neuropsychological paradigms. Here, we implemented an innovative paradigm for timing prediction to precisely study the temporal dynamics of neural oscillations. In the experiment recruiting 45 participants, expectation suppression was found for the overall electroencephalographic activity,consistent with previous hemodynamic studies. Notably,we found that N1 was positively associated with predictability while N2 showed a reversed relation to predictability. Furthermore, the matching prediction had a similar profile with no timing prediction, both showing an almost saturated N1 and an absence of N2. The results indicate that the N1 process showed a ‘sharpening' effect for predictable inputs, while the N2 process showed a‘dampening' effect. Therefore, these two paradoxical neural effects of prediction, which have provoked wide confusion in accounting for expectation suppression,actually co-exist in the procedure of timing prediction but work in separate time windows. These findings strongly support a recently-proposed opposing process theory.

关键词： Expectation suppression Predictive coding Event-related potentials Timing prediction

Synergistic Brønsted Base/Photoredox-Catalyzed Three-Component Coupling with Malonates to Synthesize δ-Hydroxy Esters and δ-Keto Esters

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Chinese Journal of Chemistry 2024年第9期42卷 957-962页

作者： Ting Li Wei Wang ming dong Zhije Zhang Sha Yu Zhengchu Chen Siping Wei dong Yi Green Pharmaceutical Technology Key Laboratory of Luzhou City Central Nervous System Drug Key Laboratory of Sichuan ProvinceSchoolof PharmacySouthwestMedicalUniversityLuzhouSichuan 646000China Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province LuzhouSichuan 646000China

Multicomponent alkene 1,2-dicarbofunctionalizations(DCFs)have emerged as a powerful strategy to rapidly incorporate both two carbon subunits across one C-C double bond in one step for enhancing molecular complexity and *** the best of our knowledge,there is only one report on photoredox-catalyzed three-component DCFs with malonates through the radical−radical cross-coupling,while photoredox-catalyzed radical-polar crossover(RPC)-type DCFs with malonates were still ***,we describe a redox-neutral RPC-type 1,2-dialkylation of styrenes with malonates and aldehydes through the synergistic Brønsted base/photoredox catalysis *** transition-metal-free strategy provides an efficient and clean approach to a broad variety ofδ-hydroxy esters and also features exceptionally mild conditions,wide compatibility of substrate scope and functional groups,and high atomic ***,three-component 1,2-alkylacylation from the same starting materials was achieved in one-pot manner through such RPC-type coupling and subsequent two-electron oxidation process,providing a set ofδ-keto esters of interest in pharmaceutical research.

关键词： Alkene difunctionalization Photoredox catalysis Malonates Radical reactions C-C coupling Synthetic methods Aldehydes Alkylation Multicomponentreactions